Robbie Erlin vs. Andy Pettitte — Career Comparison

Looking at the career totals, Robbie Erlin and Andy Pettitte are fairly close on the surface numbers. Andy Pettitte posted stronger numbers in ERA (3.85 vs 4.87) and home runs allowed (0.78 per nine innings vs 1.13). Robbie Erlin had the advantage in WHIP (1.297 vs 1.363). By the career numbers, Andy Pettitte had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.